Exercise bike



FIG. 1 is a right side, front perspective view of an exercise bike, showing my new design.

FIG. 2 is a right side, bottom perspective view thereof.

FIG. 3 is a front elevation view thereof.

FIG. 4 is a rear elevation view thereof.

FIG. 5 is a left side elevation view thereof.

FIG. 6 is a right side elevation view thereof.

FIG. 7 is a top plan view thereof.

FIG. 8 is a bottom plan view thereof.

FIG. 9 is a partially enlarged view thereof, taken from FIG. 1.

FIG. 10 is a partially enlarged view thereof, taken from FIG. 2; and,

FIG. 11 is a partially enlarged view thereof, taken from FIG. 4.

The broken lines in the figures illustrate the portions of the exercise bike that form no part of the claimed design. 

CLAIM The ornamental design for an exercise bike, as shown and described. 